What is spontaneous creativity? I imagine a kind of spring, no, rather a waterfall. Something gushes forth, seemingly eternally, effortlessly and never running dry, from the pen of Domenico Scarlatti, from the fingers of Christoph Ullrich. An unimaginative person like me thinks: That's it now. He can't think of another sonata that doesn't repeat something long since invented. But yes, there's another one! New again, different again, freshly born again. What do 555 sonatas mean? It means: an infinite number of sonatas, let anyone count them. This is exactly how Christoph Ullrich proceeds in the 12th of 17 episodes...